Year	Percent
1995	71.25
1996	70.78
1997	70.12
1998	70.56
1999	69.97
2000	70.36
2001	69.98
2002	69.53
2003	70.17
2004	70.22
2005	70.22
2006	69.77
2007	70.22
2008	70.49
2009	70.62
2010	70.5